1. NEWTON’S 1st LAW

2. pushing, pulling, throwing, lifting, stopping, kicking, etc.
Force & Newton’s 1st Law
-A ____________ is a push or pull that affects matter. Forces can ___________, ___________, or change _______________ of an object’s motion.
force
start
directions
stop
-Force is measured in _____________ ( )
-one ___________ is the force necessary to move 1 kilogram
mass 1 meter per second squared.
Newtons N
Newton
Examples of forces: ________________________________________________________________________________________________________________
pushing, pulling, throwing, lifting, stopping, kicking, etc.

3. NEWTON’S 1st LAW (Balanced Forces; The Law of Inertia)
-Newton’s first law states that as long as the forces on an object
_______________ each other, the object’s motion will not _________.
balance
change
-Commonly stated as: -Objects in motion tend to stay in motion.
-Objects at rest tend to stay at rest.
-If an object is moving, it tends to keep moving at the same speed and
in the same direction unless a force acts on it.
-An outside force that offsets the balance can change either an object’s
_______________ or _________________ or both.
Ex. Ex.
direction
speed
braking
steering

4. change NO their masses inertia mass inertia momentum INERTIA
-The term “inertia” is also commonly associated with Newton’s 1st law (also known as the “Law of Inertia”)
-Inertia is the tendency of an object to resist any ___________ in its
motion.
-Is the inertia of a moving train the same as a fly moving at the same speed? __________
change NO
-What is the difference? ___________
-The more ____________ an object has, the greater its ____________.
-How is inertia different then momentum? An object that is not moving has NO ________________ but still has ____________.
their masses
inertia
mass
inertia
momentum

5. force motion opposite air friction air resistance speed lubricant
-Friction is the ___________ that opposes the __________ of a object
when two surfaces rub each other.
-The force of friction acts in a direction ___________ to the motion of an object.
-One form of friction that often works against objects moving anywhere in our atmosphere is called ________________ or _________________
force
motion
opposite -
air friction
air resistance
-The greater the friction the faster an object will lose ___________.
-One way of reducing friction is to add a _________________.
speed
lubricant